Fiber link of 3750G-12S to a 2960-48TC

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Oct 20th, 2008
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From what I've gathered on the forums I may have incompatible GBICs between my 3750 and a new 2960. The 3750 has older 1000Base-SX modules and the GBIC installed in the 2960 is a GLC-SX-MM. Is my assumption correct that I would need GLC-SX-SM?

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Giuseppe Larosa Mon, 10/20/2008 - 13:27
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Hello Ivan,

you can connect a GBIC SX to a GLC-SX-MM using MM = multimode fiber


SX = short range => MM fiber so no problem should be expected

MM fiber has core of 50 / 65 micrometers so if you see these numbers it is fine


Hope to help

Giuseppe


talleyid Mon, 10/20/2008 - 13:33
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Thanks. We think this is the issue since we've discovered that our installers ran single mode fiber. I'm assuming that would prohibit us from using the MM module, correct?

Giuseppe Larosa Mon, 10/20/2008 - 13:40
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Hello Ivan,

the answer is yes:

think of SM fiber as a narrower filter it will drop most of optical energy of MM transmitter and so communication will not be possible using a MM TX and MM rx over SM fiber


you need two GBIC SFP that run over SM fiber


Hope to help

Giuseppe


talleyid Tue, 10/21/2008 - 08:06
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Thanks. I really appreciate the confirmation.


Grazie mille!

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